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TiO 2 @Perylene Diimide Full‐Spectrum Photocatalysts via Semi‐Core–Shell Structure
Author(s) -
Wei Weiqin,
Zhu Yongfa
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201903933
Subject(s) - diimide , stacking , perylene , photocatalysis , materials science , visible spectrum , ultraviolet , photochemistry , shell (structure) , nanoparticle , nanotechnology , chemical engineering , catalysis , optoelectronics , chemical physics , chemistry , molecule , composite material , organic chemistry , engineering
A semi‐core–shell structure of perylene diimide (PDI) self‐assembly coated with TiO 2 nanoparticles is constructed, in which nanoscale porous TiO 2 shell is formed and PDI self‐assembly presented 1D structure. A full‐spectrum photocatalyst is obtained using this structure to resolve a conundrum—TiO 2 does not exhibit visible‐light photocatalytic activity while PDI does not exhibit ultraviolet photocatalytic activity. Furthermore, the synergistic interaction between TiO 2 and PDI enables the catalyst to improve its ultraviolet, visible‐light, and full‐spectrum performance. The interaction between TiO 2 and PDI leads to formation of some new stacking states along the Π–Π stacking direction and, as a consequence, electron transfer from PDI to TiO 2 suppresses the recombination of e − /h + and thus improves photocatalytic performance. But the stronger interaction in the interface between TiO 2 and PDI is not in favor of photocatalytic performance, which leads to rapid charge recombination due to more disordered stacking states. The study provides a theoretical direction for the study of core–shell structures with soft materials as a core, and an idea for efficient utilization of solar energy.